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8. mechanical properties of solids — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics8. mechanical properties of solids1 Mark
MCQ
Mark the wrong statement
  • A
    Sliding of molecular layer is much easier than compression or expansion
  • B
    Reciprocal of bulk modulus of elasticity is called compressibility
  • ✓
    It is difficult to twist a long rod as compared to small rod
  • D
    Hollow shaft is much stronger than a solid rod of same length and same mass
✓

Answer

Correct option: C.
It is difficult to twist a long rod as compared to small rod
c
(c) For twisting, Angle of shear $\varphi \propto \frac{1}{L}$

i.e. if $L$ is more then $\varphi $ will be small.

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